Downy mildew is one of most serious diseases in Vitis amurensis Rupr..With the expansion of cultivated area,the hazard of downy mildew increasing year by year,and directly affect the grape fruit quality and yield which used for wine-making.In China,downy mildew began to spread in the production regions of Vitis amurensis Rupr.In late June,and into the peak till early August.Researchers had not yet found immune varieties or types and there was no pesticide to eradicate the disease.Authors want to discuss som...
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